Barrier Ninjutsu (結界忍術, Kekkai Ninjutsu, Literally meaning: Barrier Ninja Techniques) is the incorporation of barriers into techniques. Essentially these techniques allow the users to manipulate barriers. The user can erect barriers that can be used to protect themselves, or to trap an opponent, amongst other various uses.

The strength and efficiency of barriers seemingly depends on the type of technique used to create the barrier itself, and the ability of others to perceive, enter, or destroy the barrier. The Thirty-Six Layer Self-Repairing Barrier, created by a synchronised array of multiple shinobi, is supposedly able to contain a jinchūriki and its tailed beast, but has been shown to be unable to handle the combined efforts of two jinchūriki from breaking out. However, even the most powerful barriers, intended to prevent detection by outsiders, can be circumvented by the use of Space–Time Ninjutsu, such as Tobi's Kamui, which he used to gain access to the place where Kushina Uzumaki was giving birth to Naruto Uzumaki.[1]